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Current Affairs January 2024

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A star contains

A. about 75% of hydrogen

B. 22% helium

C. traces of most other elements including oxygen, neon, carbon and nitrogen

D. All the above

Correct Answer :

D. All the above


Related Questions

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When a whistling engine approaches a person standing on the platform, the frequency or the note

A. appears to increase

B. appears to decrease

C. does not change at all

D. first increases then decreases

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The direction of heat flow between two objects depends on

A. their heat contents

B. their masses

C. their temperatures

D. whether they are in solid, liquid or gaseous state

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The freezer in a refrigerator is placed near the top

A. to keep it away from the hot compressor which is near the bottom

B. because of convenience

C. so that it can cool the whole interior by setting up convection currents

D. to prevent too much cooling

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Tea pots are highly polished

A. so that they may reflect thermal radiation from outside and minimise such radiation from them

B. so that they may absorb all radiation from outside

C. to make them attractive to look at

D. because they take high polish

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Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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The source of electric energy in an artificial satellite is

A. mininuclear reactor

B. a dynamo

C. a thermopile

D. solar cells

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The audible range of a normal human ear is frequencies ranging from

A. 10000 to 20000 Hz

B. 50 to 15000 Hz

C. 20 to 20000 Hz

D. 15 to 50000 Hz

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The end product in the uranium disintegration series is

A. lead

B. zinc

C. carbon

D. tin

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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec

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A series of east moving still pictures can be made to appear as a moving picture because the eye

A. can focus very rapidly as pictures change

B. is quicker than the brain

C. can see two images separated only if the interval' between seeing them is more than' one-tenth of a second

D. can shut out some of the light

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Enriched uranium means

A. Uranium that is very pure

B. Uranium in which the concentration of the isotope U-238 is more than in the naturally occuring uranium

C. Uranium in which the concentration of the isotope U-235 is more than in the naturally occuring uranium

D. None of the above

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The force that keeps a body in a circular motion is called

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of

A. 330 m

B. 33 m

C. 16.5 m

D. 165 m

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Meteors

A. look like falling stars

B. are really pieces of rock or metal

C. burn up as they shoot through the air

D. All the above

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The star nearest to the sun is

A. Proxima Centauri

B. Sirius

C. Aldebaran

D. Vega

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A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure

A. is found by measuring the slanting height of the mercury column

B. is given by the vertical height

C. cannot be measured with it

D. u) can be measured by both the methods described above

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During thunder storm you are travelling in a car. To protect yourself from the lightning you will have to

A. remain in the car

B. get out of the car and lie flat in the ground

C. abandon the car and take shelter under a nearby tree

D. touch the nearest electric pole

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The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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The completely dark portion of a shadow of an object is known as

A. umbra

B. penumbra

C. image

D. black portion of light

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Nuclear fusion is a process in which

A. the atoms and molecules lose their identity

B. nucleus is split into fragments

C. the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process

D. absorption of neutron by a nucleus

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Fish and other aquatic creatures can live inside a deep frozen pond because

A. fish are cold-blooded animals

B. ice is a bad conductor of heat

C. there will always be water just beneath the ice level

D. they can adapt themselves to live in ice

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Every action has an equal and opposite reaction is Newton's law of Motion

A. first

B. second

C. third

D. fourth

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The hygrometer is an apparatus used for finding the

A. temperature of air

B. intensity of light

C. density of a liquid

D. relative humidity of the atmosphere

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The Cact that the compass needle does not point true north was observed first by

A. Sir Isaac Newton

B. Columbus

C. Archimedes

D. Thomas Alva Edison

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For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is provided by

A. the electrical attraction between the negatively charged electron and the positively charged porton

B. the high speed of the electron

C. the low speed of the electron

D. gravity

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Frictional force acts in

A. the same direction as the motion

B. the opposite direction of the motion

C. all the directions

D. upward direction

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Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

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Of the following which has got the highest frequency?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years